DC monitoring unit, DC monitor

DC monitoring unit/DC monitor (ground leakage DC detector, DC low-voltage detector, DC ammeter

This unit was designed to monitor the V DC panels of auxiliary services. It is known as the Monitoring Unit for Auxiliary Services (USSA). It comprises a ground fault detector, a DC low-voltage detector voltmeter and a DC ammeter. All 3 units are assembled into a standard 19-inch enclosure (model 19), or into an enclosure that can be mounted on the front face of a panel (PAN model), or in a compact enclosure (model P225).

  • a ground fault detector with digital display
  • a DC low-voltage detector voltmeter with digital display
  • a DC ammeter with digital display

Operating DC voltage: 24, 48, 125, 250 V DC or X (for specific voltage)

Ammeter full-scale current: 50, 100, 200, 400, 600, 800 A, etc.

 

ELECTRICAL CHARACTERISTICS

  • Power: 24 VDC system: 20 to 30 VDC, 1.5 A
  • 48 VDC system: 40 to 60 VDC, 0.8 A
  • 125 VDC system: 100 to 140 VDC, 0.3 A
  • 250 VDC system: 200 to 280 VDC, 0.2 A
  • Accuracy: 0.5% of full scale (note 1)
  • Display: – Ground fault detector: 3 digits (0.56-inch red LED)
  • Low-voltage detector: 4 digits (0.56-inch red LED)
  • Ammeter: 4 digits (0.56-inch red LED)
  • Alarm contacts: load rating: 140 VDC, 0.5 A / 24 VDC, 3 A / 125 VAC, 3 A, type: “A” (N.O.)